12. Which of the following alkyl halides can produce only a single alkene product when treated with sodium methoxide?
(A) 2-chloro-2-methylpentane.
(B) 3-chloro-3-ethylpentane.
(C) 3-chloro-2-methylpentane.
(D) 2-chloro-4-methylpentane.
(E) 2-chloro-3-ethylpentane.

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